Tool holder



J. M. PALMER Jan. 30, 1934.

TOOL HOLDER 2 Sheets-Sheet l Filed March 12, 1930 a gg mwwwwwfi 717/1John 777. Pal 111e,)".

J. M. PALMER TOOL HOLDER 2 Sheets-Sheet 2 Filed March 12 1930 Jan. 30,1934.

Patented Jan. 30, 1934 FFHCE TOOL HOLDER John M. Palmer,

Application March 12,

1 Claim.

The type of tool holder to which my invention pertains is particularlyadapted for use in boring mills, lathes, shaping and other similarmachines in which a fixed tool is held in a holder.

An object of my invention is to make the holder so that it is adaptedfor the mounting and holding of large heavy tools or tools successivelygraduated in size to comparatively thin narrow tools of a cutting offtype; the tools being locked in place by means of a set screw or othersimilar device. To effect this arrangement I form the opening in theholder for the tool with preferably a rectangular opening of full sizeto accommodate the tool of largest cross section for heavy work. Throughthis longitudinal opening I form a succession of upper and lowergrooves, these grooves being of varying width and the narrowest groovebeing formed in the next largest groove and extending deeper so thatseveral or more sizes of tools may be mounted in the same holder and thesmallest grooves being designed to carry comparatively thin cutting offtools or those for similar types of work. My holder may be built in atype for single tools and to have such tools in alignment with theholder or to have them offset or inclined to the right or to the left,or if desired to have a double mounting which may accommodate right andleft hand tools.

Another object and feature of my invention is the use of filler blocksor adaptors which may be utilized in the holders to fill up the space sothat comparatively small tools such as boring bars may be clamped inplace. With the double jaw holders I provide a single s-lidable blockwhich is engaged by the set screw and this bloc caused to engage thecutting tools.

My invention is illustrated in the accompanying drawings, in which,

Figure 1 is a perspective view of a single type of holder offset in onedirection;

Fig. 2 is a horizontal setion of Fig. l on the line 22 in the directionof the arrows;

Fig. 3 is a perspective view of another type of holder suitable for aboring mill, in which the holding jaw is in alignment with the holdingbar;

Fig. 4 is a longitudinal section of Fig. 3 on the line 44 in thedirection of the arrows;

Fig. 5 is an end elevation in the direction of the arrow 5 of Fig. 4;

Fig. 6 is a perspective view of another type of holder with the tool inalignment with the bar of the holder;

Fig. '7 is a section on the line 7-7 of Fig. 6 in the direction of thearrows;

Los Angeles, Calif.

1930. Serial No. 435,217

Fig. 8 is a perspective view of a tool holder having double jaws forholding left or right hand Fig. 9 is a vertical section on the line' 99of Fig. 8 in the direction of the arrows;

Fig. 10 a horizontal section on the line 10-10 of Fig. 9 in thedirection of the arrows;

Fig. 11 is a perspective view of a boring tool suitable for use in thejaws of the construction of Figs. 8, 9 and 10.

Fig. 12 is a perspective view of the clamping block used in theconstruction of Figs. 8 and 9;

Fig. 13 is a perspective view of another type of boring tool;

Fig. 14 is a transverse section of one of the tool heads such as on theline l414 of Fig. 3.

Fig. 15 is a modification of a holder having openings crossing eachother.

Fig. 16 is a section through a modified form 0 holder.

Referring to the drawings, in Figs. 1 and 2 I illustrate a tool holderbar 11 having a tool head 12 with an opening 13 therethrough, toaccommodate various cutting tools and a set screw 14 extendingdownwardly in the head to bear on the tool. In this construction theopening 13 has anouter end 15 at the head for the working end of thetool and an opening 16 at the bar section for the rear end of the tool.

In Fig. 3 the tool bar 17 is made in the form of a channel with a base18 and two side walls 19 and open at the top 20, having a head 21 withan opening 22 therethrough, the opening entering into the channel andhaving a set screw 23 extending through the head into the opening. InFigs. 4 and 5 I illustrate this holder as having an adaptor block 24with a V-shaped upper surface 25 and with a boring bar 26 fitted thereinand engaged by the set screw.

In Fig. 6 I illustrate a holder bar 27 with a head 28 and a hole orsocket 29 formed in the head to accommodate the tool end with a setscrew 30. In all of the constructions above mentioned the opening in thehead may be considered as having a large opening bounded by the insidesurfaces 31 on the sides and the bottom surface 32 with the small topsurface 33. On the bottom and the top there is an intermediate groove 34at the bottom and 35 at the top, these grooves 105 extending outwardlyat the top and bottom beyond the surfaces 32 and 33. In these grooves 34and 35 there is illustrated a central or smaller groove 36 at the bottomand 37 at the top. The groove at the top is wider than the groove at 110the bottom and these extend beyond the surfaces of the grooves 34 and35.

The object of the smallest grooves 36 and 3'7 is to accommodate a thintool 38 which is illustrated as having a downward taper 39 and is heldin place by the set screw, this tool being thin, is suitable for acut-off tool. A larger tool may be inserted so as to fit in the groove34 and if desired the grooves may be slightly wider than the grooves 84so that the tool will have a slight downward taper and in which casethere is preferably a space underneath the tool at the groove 36 andalso a space at the top. The largest tool fits on the main surface 32and may if desired be of sufficient size to have a sliding fit againstthe sides 81. The tops of all the tools are engaged by the set screw.

In some cases a tool is required to be used which may be considered anodd size and does not either fit in the large openings or in a pair ofthe grooves. Such an off sized tool is indicated by the numeral 40 (noteFig. 14) and in this case the tool has ribs 41 on the top and bottomwhich fit in the groove in the top and bottom of the head of the toolholder. In this case it will be noted that the sides 42 of the tool arenot sufficiently wide apart to fill the whole opening and that the upperand lower surfaces of the tool bear on the upper and lower main surfacesof the opening in the tool head.

In the construction of Fig. 13 a boring tool is illustrated designatedgenerally by the numeral 43. This has a bar section 44 with a head 45.The head has an opening 46 extending diametrically thereacross and anopening 47 at an angle. Each of these openings is provided with upperand lower grooves and various tools may be clamped in these openings,being secured in place by the set screws. Thus tools having either ribsor splines in the upper and lower surface or narrow tools may beutilized in the boring bar in place of full size tools.

In the construction illustrated in Figs. 8 through 10 the tool isillustrated as having a holder bar 48 with a head 49 having doubleopenings 50 and 51 separated by a central or web section 52. The websection is tapered so that the openings converge. These openings have noclosure on one side so that the sides or the tools held therein areexposed but are illustrated as provided with a plurality of upper andlower grooves 53, these being similar and adapted to accommodate narrowtools or tools having ribs on their upper and lower surface or both, itbeing this last construction which is specifically illustrated at Figs.8 and 9, with the body of a tool 54 received in the largest groove 53and having a rib such as previously described received in one of thesmaller grooves.

:A tool 54 is illustrated as secured to one side of the holder. The toolis gripped by a clamping block 55 which has flanged ends 56 maintainingthe block centered in the head 49. There is a socket 5'7 to receive theset screw 58. The block has a plurality of grooves 59 to accommodate atool of the full width of the largest groove or to accommodate tools oflesser width or those with a rib on the upper edge, it being the lastconstruction which is specifically illustrated at Figs. 8 and 9, withthe body of tool 54 received in the largest groove 59, and having a ribsuch as previously described received in one of the smaller grooves.When the set screw is forced downward- 1y, an inside edge 60 of theblock engages one of the upper corners of the web 52. The clamping blockthen acts on this corner as a fulcrum and bears down on the tool, thusholding the tool in position in the opening on one side of the head. Itwill be understood that right and lefthand tools may be selectivelyclamped at the respective sides or" the head and these tools and thesemay be of varying sizes.

In Fig. 11 I illustrate a boring bar 61 which is for the most partcylindrical and has a block 62 attached to one side; this block beingadapted to fit in one of the openings in the head of Fig. 8. Thisconstruction is illustrated with a transverse opening 63 with a diagonalopening 64; these openings each having grooves to accommodate tools ofdifferent sizes.

In Fig. 11 I illustrate the boring bar 61 as having-a longitudinalgroove 64', such groove being for the purpose of accommodating theflange end of the clamping block 55.

Referring to Fig. 12, a feature of the clamping block is that the uppersurface 57' slopes downwardly from the center towards each side. Thisallows a freer rocking action with the clamping bar than if it werestraight and on the top.

In Fig. 15 I illustrate a type of holder having a holding bar 65 with ahead 66. This head has a plurality of openings 6'7 which cross eachother at the center and each of these openings is provided with upperand lower grooves 68. is a set screw 69 in the top of the head. A headof this type is suitable for inserting cutters which are substantiallythe full size of the openings, or narrow cutters which fit in the upperand lower There I grooves or cutters which are of intermediate iiitioned substantially in alignment with the bar or at right anglesthereto, or at an intermediate angle or when the cutter is inserted inone of the openings adjacent the holding bar, the cutting edge of thetool may extend somewhat towards the holding bar and thus may be used tounderout work. It is obvious that the openings 6'7 may be made with aplurality of grooves, the grooves being of successively greater depth.

In Fig. 16 I show a cross section of a holder head '70 having a largeopening '71 therein. The

bottom of this opening is provided with a v-shaped groove '72 and thetop with a rectangular shaped groove '73. There is a threaded opening'74 for a set screw to clamp the tool held in this holder. more or lessimmaterial as to the exact width of the tool as the lower edge of thetool accommodates itself in the V-shaped groove '72. The upper edge ofthe tool may fit in the groove '73 but this fit does not need to be aclose fit as the set screw clamps the tool sufiiciently tight againstthe V-shaped groove in the bottom of the large opening.

The important characteristics of my invention are the openings in thetool holder are for thick or thin fiat bits or cutter blades. openingsin the tool holder are all female openings and such openings at thebottom may be provided with an angle shaped guide or groove such asillustrated at '72 in Fig. 16 and in defining this as a V-shaped grooveit is to be understood that the angle may be an obtuse angle if desired.The upper inside surface of the openings may be a groove with squareangles whereby the opening with the grooves may accommodate wide toolsor tools having a thin blade and the tools With this type ofconstruction it is These fitting in the angular guide grooves such as'72 do not need to have a tongue or rib, shaped to fit in the grooves,but may have a flat base as illustrated dotted in Fig. 16 and the upperedge of the tool fits'in the squared groove. The tools may be held inthe head at any suitable manner.

The tools or blades are all male blades and these may be of such widthas to fill substantially the whole opening or fit in the differentgrooves or guide faces at the top and bottom of the tool head. Theseguide faces or grooves, preferably arranged on the inside bottom and topsurface of the opening, may also if desired be formed as right anglesand there may be a plurality of these, that is one groove being insideof another, as illustrated in connection with Figs. 7 and 9. Thesegrooves may be shaped with corresponding grooves, narrower at the bottomthan at the top to accommodate tools which taper in shape from the topto the bottom or, if desired, they may be the same width. These groovesalso will accommodate bits or blades or cutters having a tongue or ribon their upper or lower edge or both, the said rib fitting into thegrooves with the main portion of the tool extending beyond the shouldersof the grooves somewhat as shown in connection with Fig. 14. It is to beunderstood that the bits or tools may be held in the tool head in anysuitable manner, but the usual procedure is to have a set-screw.

It will be noted, by my construction, that the tool holder has openingswith lower and top surfaces adapted to engage the bottom and top of thetool and to guide such tool in being pushed in and withdrawn from saidopenings. In addition, these upper and lower surfaces are provided withone or more grooves and each groove may be considered as having ahorizontal ledge and a vertical side surface, the deepest grooves beingcentered in the lesser grooves. The side surfaces of these grooves forma guide for the side surfaces of narrow tools and the bottom 7 surfaceof the bottom groove and the upper surface of the upper groove receivethe bottom edge and the top edge of the tools, whereby the tools aredefinitely guided. In conjunction with these grooves and these top andbottom surfaces and the opening, there is provided a means for clampingthe tools. Also, in my construction, the top and bottom surfaces of theopening are continuous from one end to the other; the horizontal andvertical surfaces and grooves are also continuous from one end to theother.

Various changes may be made in the principles of my invention withoutdeparting from the spirit thereof as set forth in the description,drawings and claim.

I claim:

In combination, a tool holder comprising an integral rigid head havingan opening therein, a longitudinally extending groove in each of a pairof opposite sides of the opening, said grooves being of uniform width.in the direction of their depth, said pair of opposite sides of theopening each comprising surfaces extending laterally from the respectivesides of the grooves, a tool shank adapted for reception in the opening,a projection on each of a pair of opposite sides of the tool shank, saidprojections being of uniform width in the direction of their projectionfrom the tool shank and being adapted for sliding lit in the grooves,the tool shank having surfaces extending laterally from the respectivesides of the base of each projection for engagement with the laterallyextending surfaces of the opening, and a set screw carried by the headand extending into one of the grooves, the shank projection which isreceived in said groove having a surface adapted for abutment by the setscrew for clamping the tool shank against the opposite grooved side ofthe opening.

JOHN M. PALMER.

